Air conditioner



FIG. 1 is a front elevation view of an air conditioner, showing our new design;

FIG. 2 is a back elevation view thereof;

FIG. 3 is a left elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front perspective view thereof; and,

FIG. 7 is a rear perspective view thereof.

The broken lines in the drawings illustrate portions of the air conditioner which form no part of the claimed design. 

CLAIM The ornamental design of an air conditioner, as shown and described. 